There are many characteristics of life that define whether or
not something is living. The key ones detailed here were that
living things are: composed of cells, complexly structured,
maintaining of their internal environment, responsive to stimuli,
able to convert materials into energy, able to grow, able to
reproduce using DNA, and able to evolve.

Under this set of criteria, humans are not unique from many
other animals and organisms. All of these properties are found in
many other organisms that are not humans. This illustrates the fact
that biological concepts can be used in more than one way, with
more than one species. Since we understand that there are tying
links between humans and other organisms, we can understand further
where we all originated from, as is discussed in evolution. Biology
and its concepts bring together the unity that is our world, and
the fact that humans share so many features with other organisms is
probably not a coincidence.